CVE-2026-80558 (GCVE-0-2026-80558)
Vulnerability from cvelistv5
Published
2026-08-26 14:37
Modified
2026-10-16 19:26
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: Avoid using invalid osd indices from primary_temp A corrupted osdmap received from a Ceph monitor or OSD may contain osd indices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts that don't exist, i.e., that are greater than max_osd or smaller than CEPH_HOMELESS_OSD (-1). These indices are used to create the up and acting set in ceph_pg_to_up_acting_osds(), called from calc_target(). While most of these osd indices are checked, the one from primary_temp is not. Subsequently, this may lead to calc_target() returning this (potentially invalid) index as target osd for a (linger) request. Because the osd_state, osd_weight, and osd_addr arrays only contain max_osd entries (with indices 0 to max_osd -1), this leads to out-of-bounds accesses when trying to read values from these arrays. This patch fixes the issue by adding a check to get_temp_osds(), so that only valid osd indices from primary_temp are used, and it falls back to using the primary from pg_temp or the up set if it is invalid. [ idryomov: changelog ]
References
Impacted products
Vendor Product Version
Linux Linux Version: 5e8d4d36bf23bb7baf027c479d54395840219928
Version: 5e8d4d36bf23bb7baf027c479d54395840219928
Version: 5e8d4d36bf23bb7baf027c479d54395840219928
Version: 5e8d4d36bf23bb7baf027c479d54395840219928
Version: 5e8d4d36bf23bb7baf027c479d54395840219928
Version: 5e8d4d36bf23bb7baf027c479d54395840219928
Version: 5e8d4d36bf23bb7baf027c479d54395840219928
Version: 5e8d4d36bf23bb7baf027c479d54395840219928
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              "value": "AV:N - Malformed primary_temp data arrives in CEPH_MSG_OSD_MAP over TCP from a Ceph monitor (mon_dispatch) or OSD (osd_dispatch); calc_target() then uses the bogus osd index in lookup_create_osd()/reopen_osd() to index osd_addr/osd_state/osd_weight without any local syscall.\nAC:L - A compromised or malicious monitor/OSD can publish an incremental osdmap whose primary_temp sets an osd index \u003e= max_osd for a victim PG; once applied, calc_target() on pending I/O, linger requests, or map-driven resends deterministically uses that invalid index.\nPR:N - The attacker acts as the remote Ceph cluster peer delivering forged osdmaps to an already-connected kernel CephFS/RBD client and needs no local account, capabilities, or user-namespace privileges on the victim host.\nUI:N - Once a kernel Ceph client session exists, osdmap updates are applied automatically and scan_requests/kick_requests recalculate targets without any mount, open, or other victim interaction at exploit time.\nS:U - Impact is confined to kernel libceph client memory and state on the Ceph client host (heap disclosure, misrouted connections, crash); it does not cross VM, IOMMU, or container sandbox boundaries to another security authority.\nC:H - Invalid acting.primary indexes past the end of kmalloc-backed osd_addr, osd_state, and osd_weight arrays, performing out-of-bounds reads of adjacent kernel heap memory that can disclose pointers and other sensitive data.\nI:H - Attacker-chosen osd indices drive out-of-bounds reads whose results are treated as authoritative OSD addresses and state for ceph_con_open() and request routing, corrupting kernel client connection targeting in ways usable for further exploitation.\nA:H - Out-of-bounds reads with large crafted osd indices can fault on unmapped kmalloc slack and trigger kernel oops or panic; misrouted linger and I/O requests also cause persistent, repeatable client failure on each malicious osdmap update."
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misrouted linger and I/O requests also cause persistent, repeatable client failure on each malicious osdmap update.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5e8d4d36bf23bb7baf027c479d54395840219928\", \"lessThan\": \"505fc50b8ff8e687b7e3ef6866269dea27366224\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e8d4d36bf23bb7baf027c479d54395840219928\", \"lessThan\": \"1c705fe8e59c6b16f48964973fb23c8ec4735b73\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e8d4d36bf23bb7baf027c479d54395840219928\", \"lessThan\": \"dfe1877d351b99eb1b1a62a3fc2d174220e88e20\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e8d4d36bf23bb7baf027c479d54395840219928\", \"lessThan\": \"e2ffeec85201b2bb748e99e12539ee1b92f62796\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e8d4d36bf23bb7baf027c479d54395840219928\", \"lessThan\": \"6799d4a916ffcb3d450d8440f9fe0f0862f768d6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e8d4d36bf23bb7baf027c479d54395840219928\", \"lessThan\": \"4f392fec075562dc93bb0c69f37423ca2af9b48f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e8d4d36bf23bb7baf027c479d54395840219928\", \"lessThan\": \"e009c5f0ad634c62f5c48a41f1f3c019ecf52555\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e8d4d36bf23bb7baf027c479d54395840219928\", \"lessThan\": \"3660b98d1204b419f6a77e9a295f148dcf38d042\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ceph/osdmap.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.15\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.15\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.266\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.217\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.184\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.153\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.105\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.46\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ceph/osdmap.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/505fc50b8ff8e687b7e3ef6866269dea27366224\"}, {\"url\": \"https://git.kernel.org/stable/c/1c705fe8e59c6b16f48964973fb23c8ec4735b73\"}, {\"url\": \"https://git.kernel.org/stable/c/dfe1877d351b99eb1b1a62a3fc2d174220e88e20\"}, {\"url\": \"https://git.kernel.org/stable/c/e2ffeec85201b2bb748e99e12539ee1b92f62796\"}, {\"url\": \"https://git.kernel.org/stable/c/6799d4a916ffcb3d450d8440f9fe0f0862f768d6\"}, {\"url\": \"https://git.kernel.org/stable/c/4f392fec075562dc93bb0c69f37423ca2af9b48f\"}, {\"url\": \"https://git.kernel.org/stable/c/e009c5f0ad634c62f5c48a41f1f3c019ecf52555\"}, {\"url\": \"https://git.kernel.org/stable/c/3660b98d1204b419f6a77e9a295f148dcf38d042\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nlibceph: Avoid using invalid osd indices from primary_temp\\n\\nA corrupted osdmap received from a Ceph monitor or OSD may contain osd\\nindices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts\\nthat don\u0027t exist, i.e., that are greater than max_osd or smaller than\\nCEPH_HOMELESS_OSD (-1). These indices are used to create the up and\\nacting set in ceph_pg_to_up_acting_osds(), called from calc_target().\\nWhile most of these osd indices are checked, the one from primary_temp\\nis not. Subsequently, this may lead to calc_target() returning this\\n(potentially invalid) index as target osd for a (linger) request.\\nBecause the osd_state, osd_weight, and osd_addr arrays only contain\\nmax_osd entries (with indices 0 to max_osd -1), this leads to\\nout-of-bounds accesses when trying to read values from these arrays.\\n\\nThis patch fixes the issue by adding a check to get_temp_osds(), so that\\nonly valid osd indices from primary_temp are used, and it falls back to\\nusing the primary from pg_temp or the up set if it is invalid.\\n\\n[ idryomov: changelog ]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.266\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.217\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.184\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.153\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.105\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.46\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.10\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"3.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-27T05:01:46.707Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-80558\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T19:26:27.095Z\", \"dateReserved\": \"2026-08-26T14:34:25.767Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-26T14:37:24.768Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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